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Subject[patch 15/20] x86, ds: use single debug store cpu configuration
Use a single configuration for all cpus.


Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---
arch/x86/kernel/ds.c | 7 5 + 2 - 0 !
1 file changed, 5 insertions(+), 2 deletions(-)
Index: b/arch/x86/kernel/ds.c
===================================================================
--- a/arch/x86/kernel/ds.c
+++ b/arch/x86/kernel/ds.c
@@ -47,9 +47,8 @@ struct ds_configuration {
/* Control bit-masks indexed by enum ds_feature: */
unsigned long ctl[dsf_ctl_max];
};
-static DEFINE_PER_CPU(struct ds_configuration, ds_cfg_array);
+static struct ds_configuration ds_cfg __read_mostly;

-#define ds_cfg per_cpu(ds_cfg_array, smp_processor_id())

/* Maximal size of a DS configuration: */
#define MAX_SIZEOF_DS (12 * 8)
@@ -1268,6 +1267,10 @@ ds_configure(const struct ds_configurati

void __cpuinit ds_init_intel(struct cpuinfo_x86 *c)
{
+ /* Only configure the first cpu. Others are identical. */
+ if (ds_cfg.name)
+ return;
+
switch (c->x86) {
case 0x6:
switch (c->x86_model) {
--
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